Subject:
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(no subject)
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Sat, 26 Apr 1997 13:09:37 GMT
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Original-From:
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Fred G. Martin <fredm@media.mitSTOPSPAMMERS.edu>
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Viewed:
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1245 times
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> I am working on a robot using 12V Barber Coleman geared motors. I have
> followed the instructions on connectingan external battery to the HB. I
> have about 15V worth of "C" Alkaline batteries connected in series and
> into the HB. The motors show they get about 12V each. There are some
> discrepencies between the voltage of one motor and the other (like 0.2V).
>
> My questions are:
> 1) what could be causing this differnce in load voltage when the motors
> are both running at equal power ratings, and whether this discrepency in
> voltage is significant?
This is normal, the transistors in the motor chips lose a couple of
volts.
> 2) During a run the robot starts out nice enough but after a few seconds
> it's as if the battery begins to die and you have to pump more power into
> the motors. Soon enough, it starts stalling at the same power rating wich
> it was using mseconds earlier. If you pick the robot up and let the
> wheels spin freely and then lay it down on the floor again, it lurches
> forward again and begins the same cycle until it starts stalling in the
> middle of execution. What could be causing this?
Probably you are driving too much current through the motor chips,
they overheat, shut down, cool off, and recycle.
Get a meter with a 2A scale and put it in series with your motor and
see how much it's drawing -- more than 1A and it's bad.
> 4) IC QUESTION: I have a PowerBook 520 Mac. The shareware version of IC
> does not run on it for some reason. It starts up and then says :
> e1=-98 e2=-98
> and dies. Any ideas???
Make sure AppleTalk is turned off so that apps have access to the
external printer/modem port.
Re PB520, please reply (to me personally if you like) letting me know
if this (or something else) solves this particular problem -- I keep
track of incompatibilities like this and I would like to know how they
are resolved.
Thank you,
Fred
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